Rotatable yarn guide for winding machines



Sept. 8, 1964 H. FOSSEN ETAL ROTATABLE YARN GUIDE FOR WINDING MACHINES Filed Feb. 19, 1963 United States Patent 3,147,930 ROTATABLE YARN GUIDE FOR WINDING MACHINES Helmet Fossen, Monchen-Gladbach, and Heinz Zumfeld,

Monchen-Gladbach-Windberg, Germany, assignors to Walter lReiners, Monchen-Gladbach, Germany Fiied Feb. 19, 1963, Ser. No. 259,521 Ciaims priority, application Germany Feb. 23, 1962 3 Claims. (Cl. 24243.2)

Our invention relates to machines for winding yarn from supply coils onto a take-up spool for producing a yarn package of a shape and size desired for further fabrication of the yarn. More particularly, the invention concerns cheese and cone winders whose take-up spool is driven by peripheral engagement of the yarn package with a rotating yarn guide of drum shape having a guiding groove closed upon itself around and along the cylinder surface of the drum so that the yarn is reciprocated along the package being wound as the yarn runs through the groove and onto the package.

In the event of yarn breakage it may happen in such machines that the yarn then dangling from the yarn package becomes wound about the rotary yarn guide and forms a wrap on the bottom of the yarn-guiding groove. Such a wrap must be removed before the winding operation can be resumed. Several ways have been proposed of doing this. For example, the drum body of the guide has been provided with lateral openings to permit inserting a tool sidewise into the guiding groove. However, such openings in the lateral faces of the guiding drum may cause fly dust and lint to enter into the interior, thus making it difficult or infeasible to use such drums for yarn of appreciably dust-forming types or requiring in some cases a considerable reduction in winding speed. Furthermore, the axial spacing between the respective drums of adjacent winding stations in a machine must be kept sufficiently large to afford a convenient insertion of tools into the lateral openings, thus increasing the space requirements per winding station.

It has also been attempted to facilitate removing the above-mentioned wraps of yarn from the front, in a substantially radial direction of the drum. For this purpose, a notch or recess has been provided in the peripheral drum surface at the intersection points of the yarn guiding groove. However, such notches across the guiding groove have been found to cause an excessive number of yarn breakages.

It is an object of our invention to provide a rotary yarn guide for winding machines that readily permits removing wraps of yarn from the bottom of the guiding groove but avoids the above-mentioned deficiencies of the devices heretofore contemplated for such purposes.

To this end, and in accordance with our invention, we provide the grooved drum body of the rotary yarn guide with a recess that extends transverse to the loop-forming yarn-guiding groove but, while intersecting the groove bottom to permit eliminating wraps of yarn therefrom, is spaced from the one lateral edge of the groove that lies at the active, yarn-guiding flank side of the groove. In other words, we give the transverse recess such an arrangement and shape that the yarn-guiding edge of the loop-forming groove is not touched or modified by the recess.

According to another feature of our invention, the recess has the shape of an elongated indentation which stays clear of the trailing lateral edge of the guiding groove but intersects, aside from the groove bottom, the leading edge of the groove. However, the transverse recess may also be formed as a round or circular indentation, for example as a bore. It is of advantage in all 3,147,930 Patented Sept. 8, 1964 lCC cases to have the transverse recess, where it extends below the bottom of the groove, a downwardly tapering or conically pointed shape. This facilitates introducing a severing tool for cutting a wrap, for example of blade, and also prevents damaging the groove proper by such tool.

The invention will be further described with reference to an embodiment illustrated by way of example on the accompanying drawing in which:

FIG. 1 is a front view of a yarn-guiding drum accord ing to the invention.

FIG. 2 shows a cross section of part of the same drum along the line IIII in FIG. 1.

FIG. 3 shows schematically the yarn guide in operative relation to the take-up spool driven thereby, the yarn guide being illustrated in cross section along the line III-III in FIG. 1; and

FIG. 4 shows in schematic perspective a modified portion of yarn-guiding drum according to the invention.

According to the diagram of FIG. 3, generally applicable to devices of the kind here described, the yarn F, coming from a bobbin or other supply coil (not shown) passes over a rotating yarn-guiding drum 1 onto a take-up spool 11 which is journalled on a holder 12 pivoted at 13 to the frame structure of the machine. The drum 1 is mounted on a shaft 1b and, during operation, rotates normally at constant speed in the direction indicated by an arrow 10. The package of yarn being wound rests against the periphery of drum 1 under its own weight and the weight of the pivoted holder 18. As a result, the spool 11 is frictionally entrained by the drum 1.

As apparent from FIG. 1, the drum 1 is provided on its periphery with a guiding groove which has mutually intersecting portions 2 and 3 and extends about and along the cylindrical drum surface. The groove forms a loop closed upon itself and of such configuration that during rotation of the drum 1 the oncoming yarn is being reciprocated along the take-up spool in order to produce a cross-wound package of yarn. In FIG. 1, one of the intersection points of the groove portions 2 and 3 is visible at the top of the drum and is denoted by 4,

According to the invention, the drum is provided with an additional transverse recess 5 for permitting any occurring wrap on the groove bottom to be cut, seized and removed from the drum. The transverse recess 5, having elongated shape in FIG. 1, stays clear of the lateral edge 7 of the groove which is adjacent to the trailing, inclined flank side of the groove that urges the yarn in FIG. 1 toward the right during rotation of the drum in the direction of the arrow 10. Consequently, the guiding edge 7 of the groove is not modified by the transverse groove. However, the transverse recess 5 intersects the bottom 6 of the groove as well as the leading edge adjacent to the inactive and steeper flank side of the groove.

By virtue of the fact that the active yarn-guiding edge 7 of the groove 3 is not interrupted by the transverse recess, the proper run of the yarn during winding operation is not impaired. When the yarn breaks and a wrap 8 as shown in FIG. 2 is formed, such a wrap in most cases is located on the bottom 6 of the groove. After stopping the drum 1, the wrap can be eliminated by inserting a severing tool into the recess 5 in the direction of the arrow 9 shown in FIG. 2. It is preferable to give the transverse yarn-cutting recess 5 a greater depth than the groove, as shown in FIG. 2. In this case, the wrap can be removed readily by passing a hook-shaped knife through the recess beneath the wrap.

If desired, two transverse recesses 5 as described above may be provided on diametrically opposite sides of the groove, this being shown in FIG. 3. The wrap can then be severed in one recess and can be removed in the other recess by passing a hook beneath the wrap so that the wrap can be pulled out as soon as it is cut on the opposite side.

Instead of giving the transverse cutting groove the elongated shape shown in FIGS. 1 and 2, it may be given various other shapes or cross sections. For example, the recess may have the shape of a generally circular notch as shown in FIG. 4 at 5b. Such a notch is producible by means of an ordinary drill bit. Is is only essential that the transverse recess intersect the bottom of the yarnguiding groove but does not modify the yarn-guiding edge of the groove. By machining the transverse recess more deeply into the drum than the yarn-guiding groove, the severing tool is kept away from the essential surface areas of the drum thus preventing any danger to the groove bottom.

We claim:

1. A rotatable yarn guide comprising a drum body having a peripheral surface for driving a yarn package being wound, a guiding groove extending about and along said surface and closed upon itself for reciprocatingly displacing the oncoming yarn along the package, said groove having two lateral edges in said surface of which one lies at the yarn-guiding side of said groove, and a fully exposed external recess in said surface extending transversely of said groove and intersecting the groove bottom to permit eliminating wraps of yarn therefrom, said transverse recess being spaced from said guiding-side edge of said groove.

2. A rotatable yarn guide comprising a drum body having a peripheral surface for driving a yarn package being wound, a guiding groove extending about and along said surface and closed upon itself for reciprocatingly displacing the oncoming yarn along the package, said groove having two lateral edges in said surface of which one lies at the yarn-guiding side of said groove, and a fully exposed external recess in said surface extending transversely of said groove and being deeper than said groove, said recess being spaced from said guiding-side edge of said groove but intersecting the bottom as well as said other edge of said groove.

3. A rotatable yarn guide comprising a drum body having a peripheral surface for driving a yarn package being wound, a guiding groove extending about and along said surface and closed upon itself for reciprocatingly displacing the oncoming yarn along the package, said groove having a substantially V-shaped cross section and having one lateral flank less steep than the other and constituting the trailing flank relative to the direction of reciprocating yarn displacement, and a fully exposed external recess in said surface extending transversely of said groove and intersecting the groove bottom to permit eliminating Wraps of yarn therefrom, said transverse recess being spaced from the edge of said groove adjacent to said one flank but intersecting the bottom as well as said other edge of said groove.

References Cited in the file of this patent UNITED STATES PATENTS 3,022,021 Zollinger Feb. 20, 1962 FOREIGN PATENTS 1,007,849 France Feb, 13, 1952 1,074,269 France Mar. 31, 1954 674,413 Great Britain June 25, 1952 

1. A ROTATABLE YARN GUIDE COMPRISING A DRUM BODY HAVING A PERIPHERAL SURFACE FOR DRIVING A YARN PACKAGE BEING WOUND, A GUIDING GROOVE EXTENDING ABOUT AND ALONG SAID SURFACE AND CLOSED UPON ITSELF FOR RECIPROCATINGLY DISPLACING THE ONCOMING YARN ALONG THE PACKAGE, SAID GROOVE HAVING TWO LATERAL EDGES IN SAID SURFACE OF WHICH ONE LIES AT THE YARN-GUIDING SIDE OF SAID GROOVE, AND A FULLY EXPOSED EXTERNAL RECESS IN SAID SURFACE EXTENDING TRANSVERSELY OF SAID GROOVE AND INTERSECTING THE GROOVE BOTTOM TO PERMIT ELIMINATING WRAPS OF YARN THEREFROM, SAID TRANSVERSE RECESS BEING SPACED FROM SAID GUIDING-SIDE EDGE OF SAID GROOVE. 